Can you write down eight eights so that they add up to one thousand?

You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?

It is always ahead of me yet I can never see it. What is it?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

What makes this number unique: 8,549,176,320?

How is the moon similar to a dollar?

How many sides does a circle have?

If 1+9+8=1, what is 2+8+9?